Un producto de 
1. (prep) en - we met at the station: nos encontramos en la estación he's at home: está en casa they're all at Susan's: están todos en casa de Susan you should be at school: deberías estar en el colegio there was a woman at the door: había una mujer en la puerta we arrive at Heathrow in two hours: llegamos a Heathrow en dos horas with places
2. (prep) a - I get up at seven o'clock: me levanto a las siete at midnight: a medianoche showing time
3. (prep) - I always go home at Christmas: siempre voy a casa para Navidad we met at Easter: nos vimos en Semana Santa with specific dates
4. (prep) - they were at breakfast//lunch//dinner: estaban desayunando//almorzando/enando she's hopeless at sports: es negada para los deportes they watched the children at play: miraban jugar a los niños. let's clean the windows as well while we're at it: ya que estamos en ello limpiemos también las ventanas, with activities
5. (prep) a - they were selling T-shirts at five pounds each: vendían camisetas a cinco libras cada una they went in four at a time: entraban de cuatro en cuatro we were going at fifty miles an hour: íbamos a cincuenta millas por hora at full speed: a toda velocidad with prices, rates etc.
6. (prep) a - she got married at eighteen: se casó a los dieciocho años with ages
7. (prep) a - she threw a stone at them: les tiró una piedra he winked at me: me guiñó un ojo in the direction of
8. (prep) - I'm surprised at your attitude: me sorprende tu actitud she was furious at the way she'd been treated: estaba furiosa por la forma en que la habían tratado because of
